The document discusses four issues related to work centers and standard cost estimates in SAP and provides solutions for each issue. The issues are: 1) An activity type not being set up for a cost center. 2) Need to maintain activity prices under the cost center before creating a work center. 3) Activity values showing as zero in the standard cost estimate. 4) Unable to determine a consumption account when running the standard cost estimate. The solutions provided include checking the activity prices and cost centers set up in output planning and the work center, and verifying account determinations and currency settings.